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maximum current drive by p89v51rd2

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cheenu02

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hi,
The maximum current drive by P1.5,P1.6 and P1.7 is 16mA each in P89v51RD and I want to know the maximum current drive by other ports .
Help me


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alexan_e

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I'm sure it is inside the datasheet but you have to provide a link to the datasheet so we can check

Alex
 

cheenu02

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all the port pins will draw 20mA of current.. maximum is 35mA which is not recommended..

hi,
According to the data sheet high current drive pins are P1.5,P1.6 and P1.7 only and these can drive 16ma each.Then how other pins drive more than 16ma.
I am not able to understand.
Please help me.
 

alexan_e

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In page 60

maximum IOL per I/O pins P1.5, P1.6,P1.7 = 20mA
maximum IOL per I/O for all other pins = 15mA

but also check page 62 because there is a significant voltage drop for the output voltage at these currents.

Alex
 

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